Pareto
Analysis

Pareto Analysis is the process of using the Pareto Principle and
(usually) the Pareto Chart to prioritize things requiring work.

Joseph Juran, the originator of the Pareto Analysis in quality, pointed
out how this analysis highlighted the vital few things that if you
addressed would give the greatest gains. He called the remainder the trivial
many, although he got into trouble for calling what could still be
important things 'trivial'. He subsequently renamed them the useful
many.

Casuistry aside, Pareto Analysis which leads to focusing on the vital
few is a key tool for quality improvement.